Demountable knob and cylinder lock



Nov. 10, 1942. w. R. SCHLAGE V DEMOUNTABLE KNOB AND CYLINDER LOCK FiledMay 29, 1940 I N V EN TOR.

A TTORNEY Patented Nov. 10, 1942 DEMOUN TABLE KNOB AND CYLINDER LOCKWalter R. Schlage, Burlingame, Calii'., assignor to Schlage LockCompany, San Francisco, Calif., a corporation of California ApplicationMay 29, 1340, Serial No. 337,837

3 Claims.

This invention relates to a demountable knob and cylinder lock for doorlocks and the like, and especially to a structure whereby the cylinderlock and the knob are removably secured to a spindle and locked by keyactuated mechanism against removal from the spindle, the presentinvention disclosing an improvement over the structures shown in my twoformer Patents No. 2,007,350 and No. 2,062,765.

The structures disclosed in the above identified patents both show aknob actuated spindle, a key means must be provided for holding andguiding actuated spindle mounted within the same, a

cylinder lock mounted in the outer end of the knob spindle, a knobmounted on the knob spindle, and enclosing the cylinder lock, adepressible latch for securing the knob against removal from thespindle, and means actuated by the cylinder lock for dogging or lockingthe latch against release, thereby providing key actuated 'means wherebythe knob and cylinder lock are locked against removal from the spindle.Further, both structures show the dogging member as being carried by andformed as a part of the key actuated spindle.

The object of the present invention is generally to improve and simplifythe construction and operation of structures of the character described,and particularly to provide a dogging member which is carried by thecylinder lock and actuated thereby, and which may also function as adriving member to rotate a key actuated spindle.

The improved structure forming the subject matter of this invention isshown by way of illustration in the accompanying drawing, in which Fig.1 is a central vertical longitudinal section of a door knob and spindle,showing the cylinder lock mounted therein and the member carried by thecylinder lock whereby the depressible latch is dogged againstdepression;

Fig. 2 is a cross section taken on line II-II of Fig. 1;

Fi 3 is a cross section taken on the same line as Fig. 2 but showing thelatch in depressed position;

Fig. 4 is a perspective view of the cylinder lock;

Fig. 5 is a perspective view of the knob spindle;

Fig. 6 is a perspective view of the key actuated spindle;

Fig. 7 is a perspective view of the depressible latch; and

Fig. 8 is a perspective view of the door knob showing the shank sleeveremoved.

Referring to the drawing in detail, and particularly to Figs. 1, 2, 4, 5and 7, A indicates a door knob and B a spindle upon which it is 55 thedepressible latch and the spring actuating the same.

To accomplish this, a T-shaped slot is formed in the spindle. The legportion of the slot lies parallel to the longitudinal axis of thespindle, as indicated at 2, and the head portion of the slot istransversely disposed, as indicated at 3. The leg portion of the slot isin this instance straddled by a pair of spaced bridging membersgenerally indicated at 4 and 5, the bridging member 5 being grooved onits inner surface, and the bridging member 4 on its outer surface, andthe grooves being of a depth equal to or slightly greater than thethickness of the spring whereby the depressible latching plate isactuated. The spring is clearly shown at 6 in Figs. 1 and 5. It ispassed over and under the bridging members 4 and 5 and one end of thespring is thus secured while the free end extends through thedepressible latching plate and exerts an outward pressure thereon.

The depressible latching plate is best illustrated in Figs. 1, 2, 3 and7. It is a rectangular shaped plate with a central opening formedtherein which is indicated at 1. This opening is substantially circularbut it has a notch '8 formed in one side thereof. The function of thecentral opening and the notch will later be described.

Properly to support and guide the depressible latching plate, thetransverse slot 3 is provided, and in addition thereto there is a secondtransverse slot which is indicated at 3a. The latter slot is formeddirectly opposite the slot 3 and is slightly wider than the slot 3 topermit the plateto be inserted therethrough when placed in positionwithin the spindle.

The knob A is provided with a shank 9 and this has a transverse slotformed in it, as indicated at III, which slot registers with the slot 3.Hence when the depressible latching plate is projected by means of thespring 6, it extends into the slot III of the knob shank and therebysecures the knob both against rotation about the spindle and againstendwise removal therefrom.

.To prevent children or any unauthorized individual from tampering withthe depressible latching plate, a shank cover or ferrule II is provided.This covers the shank of the knob and the latch C. It has a pin holeopening l2 formed therein, and by inserting a pin, the pin will engagethe upper end of the depressible latch.

Hence by applying proper pressure the latching plate may be depressedand the knob removed.

One of the important features of the present invention is to preventdepression of the latching plate so as to prevent removal of the knob,and a cylinder lock generally indicated at D is provided for thispurpose. Any suitable type of cylinder lock may be employed, forinstance, that shown in Fig. 4. It is inserted in the outer end of thespindle B prior to application of the knob, and when the knob is appliedand secured by the latch C, the cylinder lock will also be securedagainst removal, as it is held against removal by an annular flange l3formed in the outer face of the knob. A central opening I4 is formed inthe outer face of the knob to expose the key receiving end of thecylinder lock. During the formation of this opening, the flange l 3 isformed, and as it engages the outer end of the cylinder lock, removal ofsaid lock can not be made except when the knob is removed. Hence, if theknob is secured, so will the cylinder lock be secured.

Referring to Figs. 1 and 4, it will be noted that the inner end of thecylinder lock carries a dogging blade l5. This blade is detachablysecured to the inner end of the core of the cylinder lock, but it may berigidly secured thereto. The blade serves two functions, first, that ofdogging the latch C against depression, and secondly, that offunctioning as a driver to impart rotational movement to a key actuatedspindle generally indicated at E (see Figs. 1 and 6). The key actuatedspindle telescopes within the knob spindle, as shown in Fig. 1. Theinner end of the key actuated spindle is closed by a plate I6 and a slotI1 is formed therein to receive and permit the blade l to passtherethrough. When a key is inserted in the outer end of the cylinderlock and rotated, the core, together with the blade l5, will rotate,This motion is transmitted to rotate the spindle E, and this in turn mayactuate the latch of the door or any other suitable mechanism. The mainfunction of the blade i5 is, however, that of dogging or locking thedepressible latch C against depression except by an authorized person,that is, a person having the proper key for operation of the cylinderlook. When the door is locked, the blade IE will assume the verticalposition shown in Fig. 2. In this position it is impossible to depressthe latch C. On the other hand, if a key is inserted in the cylinderlock and the core and blade l5 are partially rotated, for instance, tothe position shown in Fig. 3, it becomes possible to depress the latch,as shown in Fig. 3. This time the knob may be removed and when the knobis removed, the cylinder lock may also be removed.

In the two former patents issued to me and heretofore referred to, keyactuated means were also provided for dogging the latch C againstdepression, but both of these patents distinguish over the presentstructure to the extent that the dogging means was carried by the keyactuated spindle. In the present instance, the dogging member is carriedby the cylinder lock itself. Hence the key actuated spindle may beemployed if desired, or it may be entirely eliminated, as dogging of thedepressible latch is accomplished directly by the blade [5 of thecylinder lock and not by means carried by the key actuated spindle.

Furthermore, where a demountable knob and cylinder lock of the characterdescribed are employed, it is sometimes necessary to removethe cylinderlock for repair, and it is often necessary to remove it in order tochange the combination of the cylinder lock, for instance, in apartmenthouses and the like. Repairing or changing of the combination in thecylinder lock is done in the field (i. e., not in the factory), and aslocksmiths or mechanics of varying skill are encountered under suchconditions, the structure must be simple and easy to reassemble. This isreadily accomplished in the present structure, as when the cylinder lockis replaced in the outer end of the spindle, the only care or skillthat-is required is to see that the blade I5 aligns with the slot ll ofthe key actuated spindle so that it will pass through said slot when thecylinder lock is pushed into place within the spindle. In fact, thecylinder lock can not be pushed into final place, nor can the knob beapplied, unless such alignment is insured; thus reassembling cannot takeplace unless the several cooperating parts are correctly positioned, norcan any mistakes be made.

While these and other features of the invention have been more or lessspecifically described for purposes of illustration, I wish itunderstood that various changes may be resorted to within the scope ofthe appended claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

l. The combination with a knob spindle having a door knob and a cylinderlock mounted thereon, of a depressible latch member for securing theknob and cylinder lock against removal from the spindle, a key actuatedspindle disposed within the knob spindle, said key actuated spindlehaving an aperture formed in its end, and a key actuated memberconnected to the cylinder lock and extending under the latch member andthrough the aperture in the spindle and forming a driving connectiontherewith whereby key actuation of the cylinder lock will transmitrotary movement to the key actuated spindle, said key actuated member inone position dogging the latch member against release, said latch memberhaving a notch formed therein into which the key actuated member enterswhen assuming another position and thereby undogging the latch member,said key actuated member being removable from both spindles in unisonwith the door knob and cylinder lock when the latch member is undogged,and said key actuated member being of suflicient length to pass underthe latch member when the knob and cylinder lock is being applied to thefirst named spindle thereby making it possible to undog the latch memberby means of the key actuated member before the knob and key actuatedlock are completely assembled on the first named spindle.

2. The combination with a door knob spindle, of a door knob adapted tobe applied thereto, a key actuated lock within the knob and removablewith the knob, a depressible latch member mounted in the spindle fornormally dogging the knob and key actuated lock against removal, 9.second spindle mounted within the first named spindle, a blade carriedby the key actuated lock and extended under the latch member and intodriving connection with the second named spindle, said blade beingremovable with the knob and the key actuated lock and being rotatable bythe key actuated lock to simultaneously rotate the second named spindle,and said blade being of sufficient length to pass under the latch memherwhen the knob and key actuated lock are being applied to the first namedspindle so as to make it possible to undo; the latch member by means ofthe blade before the knob and key actuated lock are completely assembledon the first named spindle.

3. The combination with a door knob spindle, of a door knob adapted tobe applied thereto, a key actuated lock within the knob and removablewith the knob, a depresslble latch member mounted in the spindle andnormally dogging the knob and key actuated lock against removal, a bladecarried by the key actuated lock and extended under the latch member,said blade being removable with the knob and key actuated lock and beingrotatable by the key actuated lock, said blade being of sufficientlength to pass under the latch member when the knob and key actuatedlock are being applied to the spindle so as to make it possible to undogthe latch member by means of the blade before the key actuated lock andknob are completely assembled on the 10 spindle.

WALTER R. SCHLAGE.

